<%@ page contentType="text/html; charset=UTF-8" pageEncoding="UTF-8" %>
<!DOCTYPE html>
<html>
<head>
    <title>JSP - Hello World</title>
</head>
<body>
<h1>用户管理系统</h1>
<form action="/user/sign_in" method="post">
    <input type="number" name="id" placeholder="ID">
    <br>
    <input type="password" name="password" placeholder="PASSWORD">
    <br>
    <input type="submit" name="" id="sign in" value="登陆">
</form>
<a href="/sign_up.jsp">注册</a>
<p style="color: #FF0000">
    ${requestScope.message}
</p>
</body>
</html>